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There have been numerous studies investigating the variation of various properties of AGN with Eddington ratio,  = Lbol/LEdd.

Panessa et al. (2007)

Kollmeier et al. (2006)

McHardy et al. (2006) discuss the concept of AGN as “scaled-up” GBHs, with specific reference to the “break frequency” in their Power Spectral Density (PSD) functions; also see work by Rob Fender et al.